I used to go out on the street and play hide and seek with some friends in my neighborhood. Other times me and my family will sit outside in the hall of our apartment and start talking with our neighbors while waiting for the power to come back again. Power cuts are regular where I come from so I learnt to make the best of it.

Depends how long and why.
If from a hurricane there usually isn't time with trees down, the pump not working and no water. Usually occupied with cutting up fallen limbs and going for water to wash in.
If from a tropical storm it usually comes back on in a matter of hours. So much rain kept me from walking my four dogs last time so some of the time was spent cleaning carpets.
...What was the question? Oh. Yeah. Entertainment. ...Hmmm..